There has been tons of different ways to use Lasers or laser modules today, but what do we really know about it? LASER is not even a word; it is simply an acronym of what the piece really is which is a Light Amplification by Stimulated Emission of Radiation. A device or a gadget that produces and emits light which is also called the "pencil beam." Laser modules make out most of the tip of what the device consists of, these are the cells and electronics which contains powerful nanometer (nm) infrared (IR) diode laser that pumps to a laser crystal, which produces light. Typical red laser pointer consists of a Battery, LD Driver and the Laser Module while a typical green laser pointer consists of a Battery, Pump LD Driver and DPSS (Diode-pumped solid-state) Laser Module. The higher the milli watt of a laser module the more powerful the laser can get. Some manufacturers offer laser modules with output power as low as 30mW (milli watt) up to superior power of 8000mW.laser module